Confusion about Services Based Architectures [SBA, SOA, EDA, ...] has been created by a number of industry elements. Industry critics like Forrester first used the term Services Based Architecture until 2000 when Gartner came up with their own term Services Oriented Architectures (SOA).  Forrester was still using the term SBA in 2002. Gartner next created the term Event Driven Architecture and has now come full circle back to SOA 2.0 (supporting both SOA and EDA like the original SBA).